{"id":1725,"date":"2022-11-08T19:46:17","date_gmt":"2022-11-08T18:46:17","guid":{"rendered":"https:\/\/theroamingworkshop.cloud\/b\/?p=1725"},"modified":"2022-11-08T20:57:04","modified_gmt":"2022-11-08T19:57:04","slug":"procesar-imagenes-satelite-de-landsat-o-sentinel-2-en-qgis","status":"publish","type":"post","link":"https:\/\/theroamingworkshop.cloud\/b\/1725\/procesar-imagenes-satelite-de-landsat-o-sentinel-2-en-qgis\/","title":{"rendered":"Procesar im\u00e1genes sat\u00e9lite de Landsat o Sentinel 2 en QGIS"},"content":{"rendered":"\n<p>Si conoces mis art\u00edculos de <a rel=\"noreferrer noopener\" href=\"https:\/\/theroamingworkshop.cloud\/b\/?p=1543\" target=\"_blank\">#WarTraces<\/a>, ver\u00e1s que utilizo im\u00e1genes sat\u00e9lite de la Agencia Espacial Europea. Hoy os cuento c\u00f3mo descargar y manipular estas im\u00e1genes de la misi\u00f3n <strong>Sentinel 2<\/strong>, as\u00ed como de <strong>Landsat<\/strong>, ya que el tratamiento es similar para ambos.<\/p>\n\n\n\n<p>Lo haremos con <a rel=\"noreferrer noopener\" href=\"https:\/\/qgis.org\" target=\"_blank\">QGIS<\/a>, para lo cual deber\u00e1s descargar e instalar este programa con el m\u00f3dulo de GRASS GIS incluido.<\/p>\n\n\n\n<div id=\"menu\" style=\"padding:20px 20px 20px 20px; border-left:2px solid darkgrey;\">\n<p style=\"font-weight:bold;\">Contenido<\/p>\n<\/div>\n<script>\nvar text;\nvar element;\n\nfunction fillmenu(){\n\nfor (let i=0; i<window.document.getElementsByTagName(\"h2\").length; i++){\nelement = window.document.getElementsByTagName(\"h2\")[i];\ntext = \"\u25b9 \"+element.innerHTML;\nvar newelement = document.createElement(\"a\");\nnewelement.innerHTML=text;\nvar postid=window.document.getElementsByTagName(\"article\")[0].id;\nvar url = \"https:\/\/theroamingworkshop.cloud\/b\/?p=\"+postid.substr(5,postid.length)+\"#\"+element.id;\nnewelement.setAttribute(\"href\", url);\nnewelement.appendChild(document.createElement(\"br\"));\nwindow.document.getElementById(\"menu\").appendChild(newelement);\n}\n}\n\nif(window.location.href.includes(\"tag\")){\n\n}else{\nwindow.setTimeout(fillmenu,2000);\n}\n\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"registro\">Registro en plataformas.<\/h2>\n\n\n\n<p>Necesitaremos crearnos una cuenta para poder acceder a ambas fuentes de datos, rellenando un formulario y confirmando la cuenta por correo electr\u00f3nico.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Copernicus Open Access Hub<\/h4>\n\n\n\n<p><a href=\"https:\/\/scihub.copernicus.eu\/dhus\/#\/self-registration\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/scihub.copernicus.eu\/dhus\/#\/self-registration<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">NASA Earthdata Search<\/h4>\n\n\n\n<p><a href=\"https:\/\/urs.earthdata.nasa.gov\/users\/new\">https:\/\/urs.earthdata.nasa.gov\/users\/new<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"descarga\">Descarga de datos.<\/h2>\n\n\n\n<p>Diferenciemos seg\u00fan la plataforma utilizada.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Copernicus Open Access Hub<\/h4>\n\n\n\n<p>Accedemos a su visor de datos y nos logueamos con las credenciales creadas.<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/scihub.copernicus.eu\/dhus\/#\/self-registration\" target=\"_blank\">https:\/\/scihub.copernicus.eu\/dhus\/<\/a><\/p>\n\n\n\n<p>Ahora, dibujaremos el <strong>pol\u00edgono delimitador<\/strong> de la zona de inter\u00e9s. Cada punto del rect\u00e1ngulo se marca haciendo click derecho, y cerramos el pol\u00edgono con doble click derecho.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1-1024x860.png\" alt=\"\" class=\"wp-image-1733\" width=\"512\" height=\"430\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1-1024x860.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1-300x252.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1-768x645.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1-676x567.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat1.png 1071w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>A continuaci\u00f3n, pulsamos el bot\u00f3n de <strong>filtro<\/strong> de la barra de b\u00fasqueda y seleccionamos la casilla de la misi\u00f3n <strong>Sentinel-2<\/strong> (tambi\u00e9n podremos delimitar las fechas de la consulta, pero por defecto se ordenar\u00e1 de m\u00e1s reciente a m\u00e1s antiguo).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2-1024x862.png\" alt=\"\" class=\"wp-image-1734\" width=\"512\" height=\"431\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2-1024x862.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2-300x253.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2-768x646.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2-676x569.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat2.png 1074w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Por \u00faltimo, aparecer\u00e1n los productos disponibles para nuestra consulta, los cuales podremos previsualizar o <strong>descargar<\/strong> en un fichero .zip comprimido.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3-1024x855.png\" alt=\"\" class=\"wp-image-1735\" width=\"512\" height=\"428\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3-1024x855.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3-300x251.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3-768x641.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3-676x565.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat3.png 1080w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/a><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\">NASA Earthdata Search<\/h4>\n\n\n\n<p>Igual que antes, deberemos loguearnos primero en su visor de datos.<\/p>\n\n\n\n<p><a href=\"https:\/\/search.earthdata.nasa.gov\/search\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/search.earthdata.nasa.gov\/search<\/a><\/p>\n\n\n\n<p>Podremos definir tambi\u00e9n una <strong>zona de inter\u00e9s<\/strong> mediante las herramientas de geometr\u00eda de la barra lateral.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10-1024x477.png\" alt=\"\" class=\"wp-image-1736\" width=\"768\" height=\"358\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10-1024x477.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10-300x140.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10-768x358.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10-1536x715.png 1536w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10-676x315.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat10.png 1905w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><strong>Filtramos<\/strong> los productos, por ejemplo seleccionando \"Imagery\", y seleccionamos <strong>HLS Landsat<\/strong> en el cat\u00e1logo.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11.png\" alt=\"\" class=\"wp-image-1737\" width=\"461\" height=\"462\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11.png 922w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11-300x300.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11-150x150.png 150w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11-768x769.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat11-676x677.png 676w\" sizes=\"auto, (max-width: 461px) 100vw, 461px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>En este caso, deberemos seleccionar las bandas que queramos descargar y que veremos a continuaci\u00f3n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12-1024x500.png\" alt=\"\" class=\"wp-image-1738\" width=\"768\" height=\"375\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12-1024x500.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12-300x147.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12-768x375.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12-1536x751.png 1536w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12-676x330.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat12.png 1909w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"TCI\">Imagen TCI (true colour o color verdadero)<\/h2>\n\n\n\n<p>Simplificando (mucho), los sat\u00e9lites capturan im\u00e1genes en distintos rangos de longitudes de onda, denominados <strong>bandas<\/strong>.<\/p>\n\n\n\n<p>Adem\u00e1s, las im\u00e1genes o fotograf\u00edas digitales que usamos para representar la realidad como las ve el ojo humano suelen estar definidas por <strong>tres capas<\/strong> de datos: una para el color rojo (<strong>R<\/strong>ed), otra para el color verde (<strong>G<\/strong>reen), y otra para el azul (<strong>B<\/strong>lue), definiendo en cada una de estas capas un valor para cada pixel con la cantidad de ese color. La combinaci\u00f3n de todos los p\u00edxeles es lo que simula una imagen similar a la realidad.<\/p>\n\n\n\n<p style=\"border-left:3px solid orange;padding-left:5px;font-size:14px;\"><i><b>TIP! <\/b>Haz la prueba y haz <b>mucho zoom<\/b> a cualquier imagen y ver\u00e1s el mosaico de p\u00edxeles que la forma.<\/i><\/p>\n\n\n\n<p>Utilizaremos las bandas capturadas por los sat\u00e9lites dentro de la <strong>longitud de onda visible<\/strong> para generar una imagen tal y como la ver\u00edamos desde el espacio.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Sentinel 2<\/h4>\n\n\n\n<p>En el caso de Sentinel 2, podemos mostrar directamente una imagen de color verdadero descargando el producto <strong>L1C<\/strong> y empleando la capa <strong>_TCI.jp2<\/strong> ubicada en la ruta <code>\/GRANULE\/DATA_CODE_NAME\/IMG_DATA\/<\/code><\/p>\n\n\n\n<p>La imagen <strong>TCI<\/strong> se ver\u00e1 de la siguiente forma:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat15.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat15-1024x757.png\" alt=\"\" class=\"wp-image-1743\" width=\"768\" height=\"395\"\/><\/a><figcaption class=\"wp-element-caption\">Deir ez Zor, Siria, 22\/10\/2017. TCI. Fuente: <strong>Copernicus Sentinel 2<\/strong>.<\/figcaption><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\">Landsat<\/h4>\n\n\n\n<p style=\"border-left:3px solid orange;padding-left:5px;font-size:14px;\"><i><b>TIP! <\/b><a href=\"https:\/\/gisgeography.com\/landsat-8-bands-combinations\/\" target=\"_blank\" rel=\"noopener\">https:\/\/gisgeography.com\/landsat-8-bands-combinations\/<\/a><\/i><\/p>\n\n\n\n<p>Para Landsat, deberemos <strong>combinar<\/strong> las diferentes bandas capturadas individualmente por el sat\u00e9lite dentro de la longitud de onda visible. Estas son:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">RED<\/td><td class=\"has-text-align-center\" data-align=\"center\">B04<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">GREEN<\/td><td class=\"has-text-align-center\" data-align=\"center\">B03<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">BLUE<\/td><td class=\"has-text-align-center\" data-align=\"center\">B02<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Acudimos a <strong>QGIS<\/strong>, y usamos la funci\u00f3n <code>i.group<\/code> del m\u00f3dulo GRASS que combinar\u00e1 las capas seleccionadas en una nueva capa multibanda RGB.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9-1024x520.png\" alt=\"\" class=\"wp-image-1742\" width=\"768\" height=\"390\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9-1024x520.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9-300x152.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9-768x390.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9-1536x779.png 1536w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9-676x343.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat9.png 1754w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Para facilitar la tarea, yo renombro las capas para ordenarlas de la siguiente manera, asegur\u00e1ndote que el script las lee correctamente:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat14.png\" alt=\"\" class=\"wp-image-1741\" width=\"348\" height=\"88\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat14.png 348w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat14-300x76.png 300w\" sizes=\"auto, (max-width: 348px) 100vw, 348px\" \/><\/figure>\n<\/div>\n\n\n<p>Quedando as\u00ed:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat16-1024x724.png\" alt=\"\" class=\"wp-image-1744\" width=\"768\" height=\"543\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat16-1024x724.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat16-300x212.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat16-768x543.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat16-676x478.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat16.png 1307w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n<\/div>\n\n\n<p>En este caso no se parece nada a la imagen anterior o a la realidad, as\u00ed que ajustamos las <strong>propiedades<\/strong> para extraer m\u00e1s color de los datos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>En primer lugar nos aseguramos de leer toda la informaci\u00f3n de las bandas usando los <strong>valores m\u00ednimo y m\u00e1ximo reales<\/strong>, en lugar de los estimados.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat17.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat17.png\" alt=\"\" class=\"wp-image-1745\" width=\"741\" height=\"629\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat17.png 988w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat17-300x254.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat17-768x651.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat17-676x573.png 676w\" sizes=\"auto, (max-width: 741px) 100vw, 741px\" \/><\/a><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>Solo con esto mejora bastante la imagen, pero le falta algo de brillo y de color.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18-1024x701.png\" alt=\"\" class=\"wp-image-1746\" width=\"768\" height=\"526\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18-1024x701.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18-300x205.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18-768x526.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18-676x463.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat18.png 1323w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>Ajustamos ahora los par\u00e1metros de renderizado de color:<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat19.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat19.png\" alt=\"\" class=\"wp-image-1747\" width=\"741\" height=\"386\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat19.png 988w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat19-300x156.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat19-768x400.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat19-676x352.png 676w\" sizes=\"auto, (max-width: 741px) 100vw, 741px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Y ya queda algo mucho m\u00e1s realista:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20-1024x690.png\" alt=\"\" class=\"wp-image-1748\" width=\"768\" height=\"518\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20-1024x690.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20-300x202.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20-768x517.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20-676x455.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat20.png 1323w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption class=\"wp-element-caption\">Deir ez Zor, Siria, 21\/10\/2017. TCI. Fuente: <strong>Landsat<\/strong>.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"SWIR\">Capa SWIR (short wave infra-red)<\/h2>\n\n\n\n<p>Utilizando las bandas de longitud de onda infra-roja, podemos ver m\u00e1s all\u00e1 de lo que ve el ojo humano, o incluso a trav\u00e9s de ciertos objetos, como es el caso de ciertas nubes o el humo.<\/p>\n\n\n\n<p>Durante los incendios del verano, vi c\u00f3mo <strong>Copernicus<\/strong> utilizaba estas im\u00e1genes para delimitar la extensi\u00f3n del fuego, y pens\u00e9 que servir\u00edan para localizar el impacto de las bombas que oculta el humo que desprenden. Y as\u00ed fue c\u00f3mo se me ocurri\u00f3 utilizarlo para <a rel=\"noreferrer noopener\" href=\"https:\/\/theroamingworkshop.cloud\/b\/?p=1543\" target=\"_blank\">#WarTraces<\/a>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Sentinel 2<\/h4>\n\n\n\n<p>Usamos el procedimiento anterior, combinando para este caso las siguientes bandas:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>RED<\/td><td>B12<\/td><\/tr><tr><td>GREEN<\/td><td>B8A<\/td><\/tr><tr><td>BLUE<\/td><td>B04<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat22.png\" alt=\"\" class=\"wp-image-1750\" width=\"762\" height=\"662\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat22.png 1016w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat22-300x261.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat22-768x667.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat22-676x588.png 676w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><figcaption class=\"wp-element-caption\">Deir ez Zor, Siria, 22\/10\/2017. SWIR. Fuente: <strong>Copernicus Sentinel 2<\/strong>.<\/figcaption><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\">Landsat<\/h4>\n\n\n\n<p>Realizamos una nueva combinaci\u00f3n, en este caso usando las bandas siguientes:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>RED<\/td><td>B07<\/td><\/tr><tr><td>GREEN<\/td><td>B06<\/td><\/tr><tr><td>BLUE<\/td><td>B04<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21-1024x858.png\" alt=\"\" class=\"wp-image-1749\" width=\"768\" height=\"644\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21-1024x858.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21-300x251.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21-768x643.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21-676x566.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat21.png 1042w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption class=\"wp-element-caption\">Deir ez Zor, Siria, 21\/10\/2017. SWIR. Fuente: <strong>Landsat<\/strong>.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Conclusi\u00f3n<\/h2>\n\n\n\n<p>Como nota final, es importante destacar el <strong>tama\u00f1o de pixel<\/strong>, ya que afectar\u00e1 al detalle de la imagen (<strong>resoluci\u00f3n<\/strong>):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sentinel 2: 10 metros.<\/li>\n\n\n\n<li>Landsat: 30 metros.<\/li>\n<\/ul>\n\n\n\n<p>Por otro lado, Landsat cuenta con im\u00e1genes desde <strong>2013<\/strong>, mientras que Sentinel solo dispone de im\u00e1genes desde <strong>2015<\/strong>.<\/p>\n\n\n\n<p>Adem\u00e1s, puedes <strong>previsualizar<\/strong> todas estas capas y combinaciones con visores web como <a rel=\"noreferrer noopener\" href=\"https:\/\/apps.sentinel-hub.com\/eo-browser\/?zoom=13&amp;lat=50.59642&amp;lng=30.21395&amp;themeId=DEFAULT-THEME&amp;visualizationUrl=https%3A%2F%2Fservices.sentinel-hub.com%2Fogc%2Fwms%2Fbd86bcc0-f318-402b-a145-015f85b9427e&amp;datasetId=S2L2A&amp;fromTime=2022-02-26T00%3A00%3A00.000Z&amp;toTime=2022-02-26T23%3A59%3A59.999Z&amp;layerId=6-SWIR&amp;demSource3D=%22MAPZEN%22\" target=\"_blank\">EO Browser de Sentinel Hub<\/a>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23.png\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23-1024x759.png\" alt=\"\" class=\"wp-image-1753\" width=\"768\" height=\"569\" srcset=\"https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23-1024x759.png 1024w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23-300x222.png 300w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23-768x569.png 768w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23-676x501.png 676w, https:\/\/theroamingworkshop.cloud\/b\/wp-content\/uploads\/2022\/11\/sat23.png 1267w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption class=\"wp-element-caption\">Bombardeos al Aeropuerto Internacional Antonov en Kyiv, Ucrania, el 26\/2\/2022, usando EO Browser.<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Si te atascas o quieres comentar, te espero en \ud83d\udc26 Twitter!<\/p>\n\n\n\n<p>\ud83d\udc26 <code><a rel=\"noreferrer noopener\" href=\"https:\/\/twitter.com\/roamingworkshop\" target=\"_blank\">@RoamingWorkshop<\/a><\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Si conoces mis art\u00edculos de #WarTraces, ver\u00e1s que utilizo im\u00e1genes sat\u00e9lite de la Agencia Espacial Europea. Hoy os cuento c\u00f3mo descargar y manipular estas im\u00e1genes de la misi\u00f3n Sentinel 2, as\u00ed como de Landsat, ya que el tratamiento es similar para ambos. Lo haremos con QGIS, para lo cual deber\u00e1s descargar e instalar este programa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1753,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-1725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-map-es","post-preview"],"_links":{"self":[{"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/posts\/1725","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/comments?post=1725"}],"version-history":[{"count":9,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/posts\/1725\/revisions"}],"predecessor-version":[{"id":1769,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/posts\/1725\/revisions\/1769"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/media\/1753"}],"wp:attachment":[{"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/media?parent=1725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/categories?post=1725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/theroamingworkshop.cloud\/b\/wp-json\/wp\/v2\/tags?post=1725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}